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Journal of the Air & Waste Management Association

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https://www.readbyqxmd.com/read/28541833/novel-hybrid-composite-discharge-electrode-for-electrostatic-precipitator
#1
M Ali, K Alam, Y T A Al-Majali, M Kennedy
Over the last few decades, electrostatic precipitators (ESP) have emerged as effective air pollution control devices for treating Coal-fired power plant exhausts. Among the components of the ESP, the discharge electrodes are extremely important in determining the collection efficiency of the ESP. Typically, in wet electrostatic precipitators, the discharge electrodes used must be made of corrosion resistant alloys, which makes them extremely expensive and heavy. Hybrid composite discharge electrodes have the potential to be lightweight and corrosion resistant substitute for traditional metal alloy electrodes used in wet electrostatic precipitators (WESP)...
May 25, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28541823/emission-factors-of-fine-particulate-matter-organic-and-elemental-carbon-carbon-monoxide-and-carbon-dioxide-for-four-solid-fuels-commonly-used-in-residential-heating-by-the-navajo-nation
#2
Wyatt M Champion, Lea Connors, Lupita D Montoya
Most homes in the Navajo Nation use wood as their primary heating fuel, often in combination with locally-mined coal. Previous studies observed health effects linked to this solid-fuel use in several Navajo communities. Emission factors (EF) for common fuels used by the Navajo have not been reported using a relevant stove type. In this study, two softwoods (Ponderosa Pine and Utah Juniper) and two high-volatile bituminous coals (Black Mesa and Fruitland) were tested with an in-use residential conventional wood stove (homestove) using a modified ASTM/EPA protocol...
May 25, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28541795/near-roadway-monitoring-of-vehicle-emissions-as-a-function-of-mode-of-operation-for-ldvs
#3
Dongqi Wen, Wenjuan Zhai, Sheng Xiang, Zhice Hu, Tongchuan Wei, Kenneth E Noll
Determination of the effect of vehicles emissions on air quality near roadways is important because vehicles are a major source of air pollution. A near roadway monitoring program was undertaken in Chicago between August 4 and October 30 2014 to measure ultrafine particles, carbon dioxide, carbon monoxide, traffic volume and speed, and wind direction and speed. The objective of this study was to develop a method to relate short term changes in traffic mode of operation to air quality near roadways using data averaged over 5 minute intervals to provide a better understanding of the processes controlling air pollution concentrations near roadways...
May 25, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28541772/fungal-levels-in-houses-in-the-fukushima-daiichi-nuclear-power-plant-evacuation-zone-after-the-great-east-japan-earthquake
#4
Naohide Shinohara, Masahiro Tokumura, Kazuhiro Hashimoto, Katsuyoshi Asano, Yuji Kawakami
Residences located within 20 km of the damaged Fukushima Daiichi nuclear power plant were evacuated shortly after the Great East Japan Earthquake. The levels of airborne and surface fungi were measured in six houses in the evacuation zone in August 2012 and February 2013. Airborne fungal levels in all of the houses in the summer were higher than the environmental standard levels for residential houses published in Architectural Institute of Japan (>1,000 CFU/m(3)). In two houses whose residents rarely returned to visit, fungal levels were extremely high (> 52,000 CFU/m(3))...
May 25, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28510489/urban-heat-island-uhi-influence-on-secondary-pollutant-formation-at-a-tropical-humid-environment
#5
Gsnvksn Swamy, S M Shiva Nagendra, Uwe Shlink
The combined action of urbanization (change in land use) and increase in vehicular emissions intensify the urban heat island (UHI) effect in many cities in the developed countries. The urban warming (UHI) enhances heat stress related diseases and ozone (O3) levels due to a photochemical reaction. Even though UHI intensity depends on wind speed, wind direction and solar flux, the thermodynamic properties of surface materials can accelerate the temperature profiles at the local scale. This mechanism modifies the atmospheric boundary layer (ABL) structure and mixing height in urban regions...
May 16, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28498787/spatial-and-temporal-variability-of-atmospheric-mercury-concentrations-emitted-from-a-coal-fired-power-plant-in-mexico
#6
Gilberto Fuentes, Bravo A Humberto, Sosa E Rodolfo, Rosas A Sergio, Magaña R Víctor, Caetano D Ernesto, Vázquez C Gustavo
Atmospheric mercury in the environment as a result of the consumption of fossil fuels, such as coal used in electricity generation, has gained increased attention worldwide because of its toxicity, atmospheric persistence, and bioaccumulation. Determining or predicting the concentration of this pollutant in ambient air is essential for determining sensitive areas requiring health protection. This study investigated the spatiotemporal variability of gaseous elemental mercury (GEM) concentrations and its dry deposition surrounding the Presidente Plutarco Elías Calles, (CETEPEC) coal-fired power plant, located on Mexico's Pacific coast...
May 12, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28498778/seasonal-ambient-particulate-matter-and-population-health-outcomes-among-communities-impacted-by-road-dust-in-british-columbia-canada
#7
Kris Y Hong, Gavin H King, Arvind Saraswat, Sarah B Henderson
In recent years, many air quality monitoring programs have favoured measurement of particles less than 2.5 microns (PM2.5) over particles less than 10 microns (PM10) in light of evidence that health impacts are mostly from the fine fraction. However, the coarse fraction (PM10-2.5) may have independent health impacts that support continued measurement of PM10 in some areas, such as those affected by road dust. The objective of this study was to evaluate the associations between different measures of daily PM exposure and two daily indicators of population health in seven communities in British Columbia, Canada, where road dust is an ongoing concern...
May 12, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28498738/biogas-production-from-anaerobic-digestion-of-food-waste-and-relevant-air-quality-implications
#8
Jeff Kuo, Jason Dow
Biopower can diversify energy supply and improve energy resiliency. Increases in biopower production from sustainable biomass can provide many economic and environmental benefits. For example, increasing biogas production through anaerobic digestion of food waste would increase the use of renewable fuels throughout California and add to its renewables portfolio. Although a biopower project will produce renewable energy, the process of producing bioenergy should harmonize with the goal of protecting public health...
May 12, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28453404/effects-of-biofilter-media-depth-and-moisture-content-on-removal-of-gases-from-a-swine-barn
#9
Tongshuai Liu, Hongmin Dong, Zhiping Zhu, Bin Shang, Fubin Yin, Wanqin Zhang, Tanlong Zhou
Media depth (MD) and moisture content (MC) are two important factors that greatly influence biofilters performance. The purpose of this study was to investigate the combined effect of MC and MD on removing ammonia (NH3), hydrogen sulfide (H2S), and nitrous oxide (N2O) from swine barns. Biofiltration performance of different MDs and MCs combination based on the mixed medium of wood chips and compost were monitored. A 3×3 factorial design was adopted, which included three levels of the two factors (MC: 45%, 55%, and 67% (wet basis); MD: 0...
April 28, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28453402/evaluation-of-carbon-emission-reductions-promoted-by-private-driving-restrictions-based-on-afc-data-in-beijing
#10
Wandi Zhang, Feng Chen, Zijia Wang, Jianling Huang, Bo Wang
Public transportation automatic fare collection (AFC) systems are able to continuously record large amounts of passenger travel information, providing massive, low-cost data for research on regulations pertaining to public transport. This data can be used not only to analyze characteristics of passengers' trips but also to evaluate transport policies that promote a travel mode shift and emission reduction. In this study, models combining card, survey, and GIS data are established with a research focus on the private driving restriction policies being implemented in an ever-increasing number of cities...
April 28, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28453399/monitoring-of-co-in-residences-with-bulk-wood-pellet-storage-in-the-northeast
#11
Alan Rossner, Carolyn E Jordan, Cameron Wake, Lydia Soto-Garcia
The interest in biomass fuel is continuing to expand globally and in the Northeastern US as wood pellets are becoming a primary source of fuel for residential and small commercial systems. Wood pellets for boilers are often stored in basement storage rooms or large bag type containers. Due to the enclosed nature of these storage areas, the atmosphere may exhibit increased levels of carbon monoxide. Serious accidents in Europe have been reported over the last decade in which high concentrations of carbon monoxide (CO) have been found in or near bulk pellet storage containers...
April 28, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28406745/measured-carbon-monoxide-concentrations-from-stock-and-reduced-emission-prototype-portable-generators-operated-in-an-attached-garage
#12
S J Emmerich, L Wang, A K Persily
There is concern about the hazard of acute residential CO exposures from portable gasoline powered generators which can result in death or serious adverse health effects in exposed individuals. To address this hazard, the U.S. Consumer Product Safety Commission has developed low CO emission prototype generators by adapting off-the-shelf emission control technologies onto commercially-available generators. A series of tests were conducted to characterize the indoor CO concentrations resulting from portable generators operating in the attached garage of a research house under seven different test house/garage configurations...
April 13, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28388332/long-term-trends-in-airborne-so2-in-an-air-quality-monitoring-station-in-seoul-korea-from-1987-to-2013
#13
Azmatullah Khan, Ki-Hyun Kim, Jan E Szulejko, Richard J C Brown, Eui-Chan Jeon, Jong-Min Oh, Yong Soon Shin, Adedeji A Adelodun
Atmospheric concentration of sulfur dioxide (SO2) was intermittently measured at an air quality monitoring (AQM) station in the Yong-san district of Seoul, Korea between 1987 and 2013. The SO2 level was compared with other important pollutants concurrently measured including methane (CH4), carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO2), ozone (O3), and particulate matter (PM10). If split into three different periods (period 1 (1987-1988), period 2 (1999-2000), and period 3 (2004-2013)), the respective mean [SO2] values (6...
April 7, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28379119/real-world-emissions-of-in-use-off-road-vehicles-in-mexico
#14
Miguel Zavala, Jose Ignacio Huertas, Daniel Prato, Aron Jazcilevich, Andrés Aguilar, Marco Balam, Chandan Misra, Luisa T Molina
Off-road vehicles used in construction and agricultural activities can contribute substantially to emissions of gaseous pollutants and can be a major source of submicron carbonaceous particles in many parts of the world. However, there have been relatively few efforts in quantifying the emission factors (EFs) as well as for estimating the potential emission reduction benefits using emission control technologies for these vehicles. This study characterized the black carbon (BC) component of particulate matter and NOx, CO, and CO2 EFs of selected diesel-powered off-road mobile sources in Mexico under real-world operating conditions using on-board portable emissions measurements systems (PEMS)...
April 5, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28379118/on-the-forming-mechanism-of-the-cleaning-airflow-of-pulse-jet-fabric-filters
#15
Cai Jiying, Hao Wenge, Zhang Cong, Yu Jiaqi, Wang Ting
To reveal the formation mechanism of a pulse-jet airflow's cleaning effect in a filter bag, a theoretical model is built by using the theory of gas jet and unitary adiabatic flow according to given specifications and dimensions of the bags and resistance characteristics of the cloth and dust layer. It is about the relationship between cleaning system structure and operating parameters. The model follows the principle that the flow and kinetic energy of jet flow injected into a filter bag should be consistent with the flow of cleaning airflow in the bag and the pressure drop flowing through the filter cloth and dust layer...
April 5, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28379117/an-evaluation-of-mass-absorption-cross-section-for-optical-carbon-analysis-on-teflon-filter-media
#16
Paige Presler-Jur, Prakash Doraiswamy, Oki Hammond, Joann Rice
Black carbon (BC) or elemental carbon (EC) is a by-product of incomplete fuel combustion, and contributes adversely to human health, visibility, and climate impacts. Previous studies have examined non-destructive techniques for particle light attenuation measurements on Teflon(®) filters to estimate BC. The incorporation of an inline Magee Scientific OT21 Transmissometer into the MTL AH-225 robotic weighing system provides the opportunity to perform optical transmission measurements on Teflon(®) filters at the same time as the gravimetric mass measurement...
April 5, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28379116/future-year-ozone-prediction-for-the-united-states-using-updated-models-and-inputs
#17
Susan Collet, Toru Kidokoro, Prakash Karamchandani, Tejas Shah, Jaegun Jung
The relationship between emission reductions and changes in ozone can be studied using photochemical grid models. These models are updated with new information as it becomes available. The primary objective of this study was to update the previous Collet et al. (2014a, and 2014b) studies by using the most up-to-date (at the time the study was done) modeling emission tools, inventories and meteorology available to conduct ozone source attribution and sensitivity studies. Results show future year, 2030, design values for 8?hour ozone concentrations were lower than base year values, 2011...
April 5, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28346795/understanding-the-emission-impacts-of-hov-to-hot-lane-conversions-experience-from-atlanta-ga
#18
Yanzhi Ann Xu, Haobing Liu, Michael O Rodgers, Angshuman Guin, Michael Hunter, Adnan Sheikh, Randall L Guensler
Converting a congested High Occupancy Vehicle (HOV) lane into a High Occupancy Toll (HOT) lane is a viable option for improving travel time reliability for carpools and buses that use the managed lane. However, the emission impacts of HOV-to-HOT-conversions are not well understood. The lack of emissions impact quantification for HOT conversions creates a policy challenge for agencies making transportation funding choices. The goal of this paper is to evaluate the case study before-and-after changes in vehicle emissions for the Atlanta, GA I-85 HOV/HOT lane conversion project, implemented in October, 2011...
March 27, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28333579/anaerobic-digestion-of-thermal-alkaline-pretreated-cephalosporin-bacterial-residues-for-methane-production
#19
Guixia Li, Weizhang Zhong, Rui Wang, Jiaqi Chen, Zaixing Li
Optimum anaerobic conditions of ephalosporin bacterial residues after thermal-alkaline pretreatment were determined by orthogonal experiments. And through biochemical methane potential tests (BMPs) for cephalosporin bacterial residues, the ability for bacterial degradation of cephalosporin was also evaluated. The thermal-alkaline pretreatment with the optimum values of 6% NaOH at 105°C for 15 min significantly improved digestion performance. With the thermal-alkaline pretreatment, the specific methane yield of the pretreated cephalosporin bacterial residue increased by 254...
March 23, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28287915/the-effects-of-deterioration-and-technological-levels-on-pollutant-emission-factors-for-gasoline-light-duty-trucks
#20
Qingyu Zhang, Juwang Fan, Weidong Yang, Bixin Chen, Lijuan Zhang, Jiaoyu Liu, Jingling Wang, Chunyao Zhou, Xuan Chen
Vehicle deterioration and technological change influence emission factors (EFs). In this study, the impacts of vehicle deterioration and emission standards on EFs of regulated pollutants (CO, HC, and NOx) for gasoline light-duty trucks (LDTs) were investigated according to the Inspection and Maintenance (I/M) data using a chassis dynamometer method. Pollutant EFs for LDTs markedly varied with accumulated mileages and emission standards, and the trends of EFs are associated with accumulated mileages. In addition, the study also found that in most cases the median EFs of CO, HC and NOx are higher than those of basic EFs in the IVE model; therefore, the present study provides correction factors for the IVE model relative to the corresponding emission standards and mileages...
March 13, 2017: Journal of the Air & Waste Management Association
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